Magnetic resonance apparatus, method and auxilliary coil element for manipulation of the B1 field

US7550973B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Helmut Greim · Höchstadt an der Aisch, DE
• Steffen Wolf · Königsee, DE

Key dates

• Filing date: Mar 21, 2008
• Grant date: Jun 23, 2009
• Expiry date: Mar 21, 2028

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/5659
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

In a method and arrangement for local manipulation of a B1 field in a first region of an examination subject in an examination volume of a magnetic resonance system, a B1 measurement value that represents the B1 field in the sub-volume during an adjustment measurement is integrally determined, and in desired radio-frequency signal parameters for a subsequent magnetic resonance measurement are predetermined on the basis of the determined B1 measurement value. At least during the adjustment measurement, the B1 field is influenced within a second region counter to the manipulation intended in the first region by means of an auxiliary coil element which is arranged in or at the second region of the sub-volume remote from the first region.